<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>

        .container{
            width: 500px;
            height: 500px;
            background-color:blue;
            display: flex;
            /* flex-direction: column; */
            justify-content: flex-end;
            align-items: flex-end;
        }

        .box1{
            width: 100px;
            height: 100px;
            background-color: red;
            flex: 3;
        }
        
        .box2{
            width: 100px;
            height: 100px;
            background-color: green;
            flex: 1;

        }
        
        .box3{
            width: 100px;
            height: 100px;
            background-color: purple;
            flex: 1;

        }


    </style>

</head>
<body>
    

    <div class="container">
        <div class="box1"></div>
        <div class="box2"></div>
        <div class="box3"></div>
    </div>

</body>
</html>